Quote:
Originally Posted by gottarollwithit
That sad, if I disconnect the fan, at the fan, then turn on the power, wouldn’t that be a good way to see if the harness is shorting to ground?
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That only proves the harness open circuit. You need to have the fan connected and measure resistance at your power wires leaving the relay.
Disconnect the fan from the harness and measure the resistance of the fan motor at its main terminals.
Your fan motor and the resistance you measured at the relay wires should be identical (and I do mean IDENTICAL).
Fan Amps = 14.4V / Fan Resistance. <- This is the most running amperage the fan will ever pull.
As an example, the spare 16" fan I have from a W126 measures 1.78Ω. 14.4V/1.78Ω = 8.08A Actual running amperage will be less due to the windings heating up and increasing in impedance and the natural current reduction of rotating electrical fields due to induction.
If you have a sensible resistance and amperage rating of your fan motor, you can rule it out. You've been through 3 of the things and the stock fans run fine on the stock wiring in the car.